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Influence of streaming potential on pulsatile pressure-gradient driven flow through an annulus.
Anish Shenoy1, Jeevanjyoti Chakraborty, Suman Chakraborty
1Mechanical Engineering Department, Indian Institute of Technology Kharagpur, Kharagpur, India.
Electrophoresis
|November 30, 2012
Summary
This study reveals how streaming potential and steric effects create asymmetric flow profiles in annular micro/nanoscale devices. These findings offer new design principles for microfluidic and nanofluidic systems.
Area of Science:
- Fluid dynamics
- Electrokinetics
- Physical chemistry
Background:
- Pulsatile flow in confined geometries is crucial for micro/nanoscale devices.
- Streaming potential effects are significant in electrokinetic phenomena.
- Traditional models often neglect ionic size (steric effects) and extreme zeta potentials.
Purpose of the Study:
- To investigate pulsatile pressure-gradient driven flow in an annulus considering streaming potential.
- To incorporate non-Debye-Hückel zeta potentials and steric effects for improved accuracy.
- To analyze the resulting velocity profiles and identify novel flow behaviors.
Main Methods:
- Theoretical modeling of fluid flow in an annular confinement.
- Inclusion of modified Boltzmann statistics accounting for finite ion size (steric effects).
- Analysis of streaming potential influences on flow dynamics beyond traditional limits.
Main Results:
- Demonstrated an intrinsic asymmetry in the annular flow velocity profile.
- Showcased the non-intuitive interplay between streaming potential and steric interactions.
- Identified conditions leading to velocity profile asymmetry.
Conclusions:
- Streaming potential and steric effects can induce asymmetric flow in annuli.
- Findings challenge traditional assumptions in electrokinetic flow modeling.
- Provides a basis for designing advanced micro/nanoscale flow devices with annular geometries.
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